If you want to use redirect offers in activities that use
Adobe Analytics as the reporting source (A4T), there are additional minimum
requirements your implementation must meet. For more information, see
Redirect Offers - A4T FAQ
.

mbox.js

Version 53 or later.

Version 58 or later is recommended. If the Marketing Cloud ID
Service and Adobe Analytics in Target (A4T) are being used, v58 is the
minimum-supported
mbox.js version.